Valve Timing Control Eccentric Spring Support for Reduced Vibration
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Solution Overview
Problem
Existing valve opening-closing timing control devices suffer from spring member displacement due to insufficient regulation, leading to fluctuations in load and increased vibrations, particularly at high rotational speeds.
Innovation Solution
A valve opening-closing timing control device with a concave portion on the eccentric member that houses a spring member, featuring a spring support surface with a smaller protrusion at the central position and a rough surface to stabilize the spring member, ensuring consistent biasing force application even at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spring member is housed in a conventional concave accommodation portion with wall-shaped portions at the ends, then the spring member is constrained in the circumferential direction, but the spring member still displaces due to insufficient regulation, causing load fluctuations and vibrations
Solution Approach 1:
The invention applies local quality by creating a specific protrusion structure at the central position of the spring support surface. This protrusion provides localized regulation of the spring member's position, ensuring consistent contact between the spring member and the support surface. The localized structural modification addresses the position stability issue without requiring complete redesign of the entire accommodation portion.
Solution Approach 2:
The protrusion structure is designed to preliminarily regulate the spring member's position before operation. By pre-positioning the spring member against the protrusion, the system ensures that the spring member maintains proper contact during high-speed rotation, preventing displacement and subsequent vibrations before they can occur.
2Ease of operation
If the spring member is allowed to move freely in the concave accommodation portion, then the spring member can accommodate position fluctuations, but the load fluctuates and vibrations increase
Solution Approach 1:
The protrusion structure provides localized position regulation at the central contact point, ensuring that the spring member maintains consistent contact with the support surface. This localized feature allows the spring member to self-adjust within the concave portion while maintaining reliable biasing force application to the gear teeth.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The configuration stabilizes the spring member's position, reducing fluctuations in biasing force and minimizing vibrations, thereby maintaining precise valve timing control during high-speed operation.
Implementation Method 1
a spring member to be arranged in the concave portion, the spring member applies biasing force of meshing the external teeth portion of the input gear with the internal teeth portion of the output gear
Data Source
AI summary
A valve opening-closing timing control device includes an eccentric member that meshes an external teeth portion of an input gear with an internal teeth portion of an output gear. A concave portion on the eccentric member allows a spring member to be arranged in the concave portion. The spring member applies biasing force of meshing the external teeth portion with the internal teeth portion. The concave portion includes a spring support surface that receives biasing force of the spring member. When viewed in a direction along an eccentric axis, a top surface on the spring support surface has a smaller protrusion amount at a circumferential-direction central position of the spring support surface, as compared to an eccentric arc surface whose center is the eccentric axis.